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Loans - Amounts of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage warehouse | $ 3,665,343 |  | $ 3,012,553 |  |  |
Total loans | 3,666,625 |  | 3,013,332 |  |  |
Allowance for loan losses | (17,956) | $ (18,305) | (17,820) | $ (17,798) | $ (17,071) | $ (16,394)
Loans, net | 3,648,669 |  | 2,995,512 |  |  |
Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 2,046,165 |  | 1,721,590 |  |  |
Mortgage warehouse | 2,048,035 |  | 1,723,535 |  |  |
Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Real Estate, Total | 796,497 |  | 668,141 |  |  |
Mortgage warehouse | 952,116 |  | 742,244 |  |  |
Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 668,332 |  | 549,481 |  |  |
Mortgage warehouse | 665,192 |  | 546,774 |  |  |
Working Capital and Equipment [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 915,449 |  | 804,083 |  |  |
Real Estate Including Agriculture [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 1,005,124 |  | 834,037 |  |  |
Tax Exempt Loans Receivable [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 59,620 |  | 48,975 |  |  |
Other Commercial Loans [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 65,972 |  | 34,495 |  |  |
1-4 Family [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Real Estate, Total | 788,574 |  | 659,754 |  |  |
Other Real Estate Loans [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Real Estate, Total | 7,923 |  | 8,387 |  |  |
Auto [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 358,792 |  | 327,413 |  |  |
Recreation Consumer Loans Receivable [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 16,396 |  | 13,975 |  |  |
Real Estate Home Improvement Loans Receivable [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 44,105 |  | 39,587 |  |  |
Home Equity Loan [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 239,041 |  | 163,209 |  |  |
Mortgage warehouse | 278,577 |  | 198,364 |  |  |
Unsecured Debt [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 6,986 |  | 4,043 |  |  |
Other Consumer Loans [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Commercial/Consumer, Total | 3,012 |  | 1,254 |  |  |
Mortgage Warehouse Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage warehouse | $ 155,631 |  | $ 74,120 |  |  |

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